Ferrari Part Number 100123, 1ST UNDERSIZE 0.254 MM. ON ? shown here as used in Ferrari Mondial t 3.4 Coupe/Cabriolet Table 2 Crankshaft - Connecting Rods And Pistons. Location in Diagram: 4. Required Quantity: 0. This Ferrari part is used in more than one diagram. Click on the diagrams below to see alternative uses of this part: